High-potential condenser



Jari. 21, 1930. w. DUBILIER 1,744,454

HIGH POTENTIAL CONDENSER Original Filed March 9, 1919 I v I r I I I I I r I I I I I I I I I I I ,1 ,,,r 1,/,/,,,// VI'g 7 W19 QR,

AAA Arm Patented Jan. 21, 1930 UNITED jS-TATESPATENT OFFICE WILLIAM DUBILIER, OF BRONXVILLE, NEW YORK, ASSIGNOR TO D UBILIER CON- DENSER CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE HIGH-POTENTIAL CONDENSER .Original application filed March 9, 1919, Serial No. 281,183. Divided and this application filed March 18, 1926. Serial No. 95,644.

- circuits, for example in wireless sets, and has for an object so to construct a condenser as to minimize the liability of breakdown or failure of insulation in use, and yet to avoid the necessity of employing a large amount of insulating material in accomplishing this result.

Another object is to provide a condenser in which the conducting elements are effectively compressed to hold them in proper relation to eachother, and in such manner as to insure that the pressure will be evenly applied when the condenser is assembled, and

properly maintained during use thereof.

The present application is a division of Patent No. 1,639,650 dated August 23, 1927, issued on my prior application, Serial Number 281,183, filed March 9, 1919, entitled High potential condensers, in which patent I have made generic claims covering broadly certain features of the invention hereinafter more specifically claimed, as well as specific claims to other features of the invention which are not herein claimed.

Further objects and advantages will be in part obvious and in part specifically mentioned in the description hereinafter contained, in which is disclosed one embodiment of the invention; such embodiment however is to be considered merely illustrative of its principle. In the drawings- Fig. 1 is a central horizontal section.

through a condenser constructed in accordance with the invention.

Fig. 2 is a central vertical section through the condenser shown in Fig. 1.

A casing 1, of any convenient shape, is

provided, which is ordinarily'made of metal, and forms a ground connection for one terminal of the condenser. A plurality of condenser units 2 are contained within the casing, each unit preferably comprising a plurality of interleaved conducting plates of opposite polarity as is well known in the art. In order to facilitate the insulation of the condenser units which are to be'subjected to high poten-: tial strains in use, the several umts are so parts and other units which are at higher potential difference therefrom. In the present instance, the condenser sections are connected into sets 3 and 4, the sections'of each set being in series, and the sets being connected in parallel, The two sets are assembled to form a block with the low potential units adjacent and connected to walls of the casing, by connections 5, and the high potential units joined by a connection 7 which leads to any suitable terminal, for instance a post 8', mounted on an insulating cover 9 for the casing.

If the condenser were made merely of a plurality of units connected in series, the potential of course from one end would rise progressively to the other, and the high. potential end or unit would require special construction and a large amount of insulating material, to insulate it properly from the casing, or other adjacent metallic bodies connected to the casing. With the low potential units disposed at the ends of the block, however, the units adjacent to walls of the casing are at substantially the same potential as the tion of the condenser block, and the walls of the, casing.

The term high potential as applied to certain of the condenser units in the specific type of condenser disclosed, is intended to mean elements are the most efficient and durable.

If the condenser be made merely of a plurality of units connected in series, the use of metallic clamping elements held firmly with metallic parts, is difficult, owing both to the fact that the high potential end of the block must be highly insulated and spaced from metalparts, and to the fact that intermediate metallic elements extending between the high and low potential ends of the block, would be undesirable. Insulating .material has therefore been used to compress condensers of the above character, but such material is disadvantageous in that it deteriorates and weakens when putunder stress other than compression in use, as is well known in the art. With condensers constructed in accordance with this invention, however, the end unit or units of the condenser block are at substantially the same potential as the metal clamp, which potential also may be very low, and thus metallic clamping elements may safely be employed.

In the embodiment of the invention herein claimed, the condenser units are compressed by means of a suitable metal clamp which is separate from the condenser casing and con tained therewithin. As shown in Fig. 1, a

plurality of condenser units, preferably assembled into a block composed of sets 3 and 4. of condenser sections as previously described and disposed parallel to side walls of the casing,,are engaged by compressor members lit and 15, which abut the end of the block, suitable binding members such as bolts 16, being used to draw the compressor members together. If desired, the compression maybe applied at a point substantially in line with the center of the block, by interposing plate 17 between the compressor member 14 and the end unit of the block, such plate being provided with a projection 18 in line with the center of the block, which cooperates with a similar recess in the compressor member.

With a construction of the type shown in Fig. 1, the condenser units may be assembled and put under compression before being placed in the casing, or removed from the casing without releasing the compression. In the manufacturing of condensers, it is customary to impregnate the same with a wax composition while the units are under com- ,pression, and with a condenser of the character shown in Figs. 1 and 2, it is possible to employ the compressor members 14 and 15 for the purpose of supplying the necessary compression for the impregnating treatment, and then place the sections in final position within the metallic casing, without disturbing them after impregnation.

If sets of'sections connected in parallel be employed, the compression members 14, 15, and the bolts 16, may all be of metal and un-, insulated from each other or from the casing, since all of these parts will be at the same potential when in use.

While a specific form of the invention has been described, it will be obvious that many changes may be made without departing from its spirit, as defined-in the following claims.

I claim:

1. A high potential condenser comprising a casing, a plurality of sets of condenser units therewithin, said sets being connected in parallel, each of said sets comprising a plurality of condenser units connected in series, the

jacent to walls of said casing, and a clamping device independent of and within said cas-. ing engaging the low potential condenser units to exert compression thereon.

2. A high potential condenser comprising a plurality of condenser units of stepped potential assembled in a stack, a casing for said units, circuit connections whereby the end units of said stack are at substantially the same potential when the condenser is subjected to electrical stress and an independent metallic clamp within said casing and bearing upon'said end units to exert compression thereon.

3. An electrical condenser comprising a box-like metallic casing, a stack of condenser units disposed within said casing with the units substantially parallel to opposite side walls of the casing, and an independent metal clamp contained within said casing and bearing against'the opposite endunits of said stack to compress the same, together with electrical connections to said stack whereby said clamp and casing are maintained at similar potentials.

4. A high potential condenser comprising a plurality of condenser units of stepped potential assembled into a stack, a casing for said units, circuit connections whereby the end units of said stack are at substantially the same potential when the conderser is subtial assembled into a stack, circuit connections whereby the end units of said stack are at substantially the same potential when the condenser is subjected to electrical stress, a

clamp for said stack comprising relatively narrow tension members extending along the sides of the stack so as to leave the sides substantially exposed, and compression members overlying the ends of the stack.

6. An electrical condenser, comprising a' plurality of condenser units of stepped po-- tential assembled into a stack, circuit connections whereby the end units of said stack are at substantially the same potential when the condenser is subjected to electrical stress, a clamp for said stack comprising relatively narrow tension members extending alongrthe sides of the stack so as to leave the sides substantially exposed, compression members overlying the ends of the stack and insulating material surroundin the sides of the stack. In testimony that% claim the foregoing, I have hereunto set my hand this 9th day of March, 1926. -WILLIAM DUBILIER. 

